AMD64

Etymology
From being a 64-bit architecture developed by.

Proper noun

 * 1)  The 64-bit version of the x86 instruction set architecture (as opposed to the original 16-bit x86 architecture, or to the 32-bit version of the x86 architecture, also known as IA-32, i386, or x86-32).

Usage notes
is mostly used in the context of Unix and Linux operating systems; Windows systems refer to this architecture as. System-agnostic discussions tend to use either or. In all cases, each of these three terms are almost always used attributively.

Hypernyms

 * (broad sense)

Coordinate terms

 * (16-bit x86)
 * ,, (narrow sense),  (32-bit x86)